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Cyclic photophosphorylation is thought to occur mainly in the

(a) grana lamellae Your answer
(b) stroma Your answer
(c) outer membrane Your answer
(d) stroma lamellae Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

Cyclic photophosphorylation occurs mainly in the stroma lamellae, which have PS I but lack PS II and NADP reductase.

Why the other options are wrong

(a) · your answer Grana lamellae have both photosystems and carry out non-cyclic flow.
(b) · your answer The stroma is the fluid matrix, not a membrane.
(c) · your answer The outer membrane has no photosystems.

NCERT point: No PS II and no NADP reductase means no non-cyclic flow in the stroma lamellae.

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